Opacifying polymer particles
US9574103B2 · kind B2 · utility
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Key dates
| Filing date | Dec 17, 2013 |
| Grant date | Feb 21, 2017 |
| Priority date | — |
| Expiry date | Dec 17, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K2003/2241
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An aqueous dispersion of pigmented opacifying polymer particles, the particles comprising: i. an inorganic core comprising dispersed inorganic pigment particle and a dispersant ii. a first layer of base-swellable polymer comprising acid groups encapsulating the core iii. a second layer of non-base-swellable polymer encapsulating the first layer wherein the dispersant comprises or consists of hydroxyl moieties; and carboxyl groups derived from itaconic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.